Vocabulary
What is Thermal Energy?
The measurement of kinetic and potential energy
Sally is an astronaut that weighs 140Lbs and a mass of 300Kg. When she travels to the moon. She realize her weigh changes but her mass does not. Why???
Weight changes depending on the gravity of that location. Mass remains the same if the amount of matter you started with remain the same as well
How do you know when a chemical reaction has occurred?
When a new substance have been made
Describe the spatial arrangements of solids, liquids, and gas
Solid: Tightly packed Particles
Liquid: far but close enough to move around
Gas: widely spread out
Sally ate a ice cream in the summer heat. Two minutes later, it started to drink onto her dress. What phase change is this ?
Melting
What is an Element ?
A pure substance made of only ONE type of atom (element)
How do you kind the volume of an irregular shape Object?
You have submerge your object in a given amount of water. How water that gets displaced is the volume of the object
Give me 3 OBSERVABLE pieces of evidence that shows a chemical reaction has occurres
Color change, Gas production, Formation of precipitate
TRUE or FALSE
Solids are only hard? explain
FALSE: solids have properties that make them brittle, smooth, flexible, etc
Danny watched in rain all night long. In the morning, he went outside and he saw that the ground was dry. What phase change happened?
Evaporation
What is a mixture?
When two or more substances physically combine and each substance keeps its original properties.
How do you know when two objects have the same density?
They are made of the same material.
What is the law of conservation of Mass
Mass is not created or destroyed during a chemical reaction
How does the volume of a LIQUID differ from the volume of a Gas?
The volume of a liquid is definite( no change) while the volume of a gas is not definite(change)
During the process of freezing, what happens to the spatial arrangment and motion of particles
Particles slow down to a vibrate and come closer together in a fixed position
What is a compound?
A pure substance made of 2 OR MORE different elements that are chemically bonded to each other
Alex mixes a yellow powder with a clear liquid in a plastic cup. The reaction starts to bubble and Fizz.
Name 2 physical properties about the reactants before mixing
During an endothermic reaction, What is happening to the reaction compared to the surroundings?
The reaction absorbs heat (increase temp) the surroundings release heat (decrease in temp)
How does a gas and liquid get a shape?
They take the shape of the container its in at that moment.
During the process of condensation, what happens to the spatial arrangement and motion of particles?
Particles slow down and go from widely spread out to closer BUT not fixed
What is an Atom?
The basic building blocks of matter.
WHAT ALL MATTER IS MADE OF!!!!!!
How do you know when something is physical?
When only the form or appearance looks different but no new substance is created
How many TOTAL atoms does this molecule have? Explain
Ca4CO2
Ca=4, C=1, O=2
total= 7 atoms
Which has a higher viscosity? Solids, liquids, or gases EXPLAIN
Solids because they don't flow
What 3 phase changes requires thermal energy to be Absorbed?
Melting(solid to liquid)
Evaporation(liquid to gas)
Sublimation(solid to gas)